'''
打印三角形图案
'''

'''
左对齐
'''
row = int(input('请输入行数：'))
for i in range(row):
  for _ in range(i + 1):
    print('*', end='')
  print()

'''
右对齐
'''
for i in range(row):
  for j in range(row):
    if j < row - i - 1:
      print(' ', end='')
    else:
      print('*', end='')
  print()

'''
居中对齐
'''
for i in range(row):
  for _ in range(row - i - 1):
    print(' ', end='')
  for _ in range(2 * i + 1):
    print('*', end='')
  print()